71789321 has 4 divisors (see below), whose sum is σ = 72087444. Its totient is φ = 71491200.

The previous prime is 71789309. The next prime is 71789327. The reversal of 71789321 is 12398717.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29278921 + 42510400 = 5411^2 + 6520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71789321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71789327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148700 + ... + 149181.

It is an arithmetic number, because the mean of its divisors is an integer number (18021861).

Almost surely, 2^71789321 is an apocalyptic number.

It is an amenable number.

71789321 is a deficient number, since it is larger than the sum of its proper divisors (298123).

71789321 is a wasteful number, since it uses less digits than its factorization.

71789321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298122.

The product of its digits is 21168, while the sum is 38.

The square root of 71789321 is about 8472.8579003781. The cubic root of 71789321 is about 415.6105996933.

The spelling of 71789321 in words is "seventy-one million, seven hundred eighty-nine thousand, three hundred twenty-one".